<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    div {}
  </style>
</head>

<body>
  <form action="http://127.0.0.1:9000" method="post">
    <input type="text" name="username">
    <input type="text" name="password">
    <input type="submit" value="提交">
  </form>

</body>

</html>